SC-LDPC codes over the block-fading channel: Robustness to a synchronisation offset

Iryna Andriyanova (1) , Najeeb Ul Hassan (2) , Michael Lentmaier (3) , Gerhard Fettweis (2)

1 ETIS - UMR 8051 - Equipes Traitement de l'Information et Systèmes
2 TU Dresden - Technische Universität Dresden = Dresden University of Technology
3 Skane University Hospital [Lund]

Spatially-Coupled LDPC (SC-LDPC) codes have been recently shown to be very efficient for transmissions over nonergodic channels, in particular over block-fading channels [1]. In fact, it is possible to design a SC-LDPC code with any given code diversity [2]. In this work, we investigate the performance of SC-LDPC codes over block-fading channels, assuming a mismatch (or offset) between the first bit of a transmission packet and a first bit of a codeword. Such a mismatch is called the synchronisation offset, and it has a negative impact on the code diversity. We propose a data-allocation scheme for SC-LDPC codes that allows to obtain a robustness to the synchronisation offset. Combined together with the code design from [2], it allows to design efficient SC-LDPC codes, whose performance degrades only slowly under imperfect transmission conditions.

Mots clés: SC-LDPC codes; block-fading channel; synchronisation

Domaines: Théorie de l'information [cs.IT]

Iryna Andriyanova, Najeeb Ul Hassan, Michael Lentmaier, Gerhard Fettweis. SC-LDPC codes over the block-fading channel: Robustness to a synchronisation offset. 2015 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom), May 2015, Constanta, Romania. ⟨10.1109/BlackSeaCom.2015.7185094⟩. ⟨hal-01262846⟩